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Officials say shootings appear random

The shooter was a former doctor at the hospital, spokesman for facility says

New York (CNN)A doctor opened fire with an assault rifle Friday inside a New York City hospital where he used to work, killing a woman and wounding six people before turning the gun on himself, law enforcement officials said.

The shooting started a little before 3 p.m. ET at the Bronx-Lebanon Hospital. The 972-bed facility is one of the largest providers of outpatient services in New York.

Police said somebody called 911 to report a man with a gun on the 16th floor.

Police converged on the scene and officers found the gunman dead of a self-inflicted gunshot wound on the 17th floor, New York City Police Commissioner James O'Neill said at a news briefing.

Henry Bello

The man was wearing a white lab coat and carrying ID and his firearm was nearby, O'Neill said.

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The shooter, Henry Bello, was a "disgruntled (former) employee" who worked at the hospital from August 2014 to February 2015, a hospital spokesman said. Errol Schneer told reporters that Bello resigned before he was to be fired.

Schneer said Bello likely did not know any of the people he shot, but that police are investigating the matter.

The body of a female doctor was found close to the gunman's body, O'Neill said. The woman's name was not immediately released.

Sridhar Chilimuri, Physician-in-Chief at the hospital, said the victim was shot at random.

Six people were wounded on the 16th floor, and five -- who are hospital staff members -- are in serious condition from gunshot wounds. They are all in the intensive care unit, Chilimuri said.

Another person, who was already a patient, was injured and is in stable condition.